Laser Shock Wave-Assisted Patterning on NiTi Shape Memory Alloy Surfaces

Saidjafarzoda Ilhom, Dovletgeldi Seyitliyev, Khomidkohodza Kholikov, Zachary Thomas, Ali O. Er, Peizhen Li, Haluk E. Karaca, Omer San

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Shape memory alloys (SMAs) are a unique class of smart materials and they were employed in various applications in engineering, biomedical, and aerospace technologies. Here, we report an advanced, efficient, and low-cost direct imprinting method with low environmental impact to create thermally controllable surface patterns. Patterned microindents were generated on Ni50Ti50 (at. %) SMAs using an Nd:YAG laser with 1064 nm wavelength at 10 Hz. Laser pulses at selected fluences were focused on the NiTi surface and generated pressure pulses of up to a few GPa. Optical microscope images showed that surface patterns with tailorable sizes can be obtained. The depth of the patterns increases with laser power and irradiation time. Upon heating, the depth profile of SMA surfaces changed where the maximum depth recovery ratio of 30% was observed. Recovery ratio decreased and stabilized when the number of pulses and thus the well depth were further increased. A numerical simulation of pressure evolution in shape memory alloys showed a good agreement with the experimental results. The stress wave closely followed the rise time of the laser pulse to its peak value and initial decay. Rapid attenuation and dispersion of the stress wave were found in our simulation.

Original languageEnglish
Pages (from-to)224-231
Number of pages8
JournalShape Memory and Superelasticity
Issue number1
StatePublished - Mar 1 2018


  • Indentation by laser shock wave
  • Martensite
  • Mechanical behavior
  • NiTi shape memory alloys
  • Shape/depth recovery
  • Stress-induced martensitic phase transformation

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Science (all)


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